<template>
 <el-container class="home-container">
  <!--头部区域-->
  <el-header>
    <div>
      <img src="../assets/heima.png" alt="">
      <span>后台管理系统</span>
    </div>
    <el-button type="info" @click="Logout">退出
    </el-button>
  </el-header>
  <el-container>
    <!--侧边区域-->
    <el-aside :width="iscollapse ? '64px' : '200px'">
      <!--折叠展开菜单-->
      <div class="toggle-button" @click="toggleCollapse">|||</div>
      <!--侧边栏菜单区 各属性见文档-->
      <el-menu :unique-opened="true"
      :router="true" :collapse-transition="false"
      :collapse="iscollapse" background-color="#333744"
      text-color="#fff"  active-text-color="#409eff"
      :default-active="activePath">
      <!--default-active可等于$route.path-->
      <!--一级菜单-->
      <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
        <!--一级菜单模板-->
        <template slot="title">
          <!--图标-->
          <i :class="iconObj[item.id]"></i>
          <span v-text="item.authName"></span>
        </template>
        <el-menu-item v-for="subitem in item.children"
        :key="subitem.id" :index="'/'+subitem.path"
        @click="saveNavStatus('/'+subitem.path)">
          <template slot="title">
          <!--图标-->
          <i class="el-icon-menu"></i>
          <span v-text="subitem.authName"></span>
          </template>
        </el-menu-item>
      </el-submenu>
    </el-menu>
    </el-aside>
    <!--主体区域-->
    <el-main>
      <!--路由占位符-->
      <router-view></router-view>
    </el-main>
  </el-container>
</el-container>

</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menulist: [],
      // 图标类
      iconObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 菜单是否折叠
      iscollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    Logout() {
      window.sessionStorage.clear()
      this.$router.push('/')
    },
    // 获取左侧菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
    },
    // 点击按钮切换菜单的折叠与展开
    toggleCollapse() {
      this.iscollapse = !this.iscollapse
    },
    // 保存链接激活状态
    saveNavStatus(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
// lang="less"需要less-loader版本低于8.0
.home-container{
  height: 100%;
}
.el-header{
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0px;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left:15px ;
    }
  }
}
.el-aside{
  background-color: #333744;
  .el-menu{
    border-right: none;
  }
}
.el-main{
  background-color: #eaedf1;
}
.iconfont{
  margin-right: 10px;
}
.toggle-button{
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
